Reamer and burnishing tool



Nov. 6, 1928.

w. A. KOCH nmman AND aunmsnme TOOL Filed July 19, 1924 2 Sheets-Sheet 1 nv W/LKo n- FY 444 w mum) Nov. 6; 1928.

W. A. KOCH REAMER AND BURNISHING TOOL 2 Sheets-Sheet P Filed July 19, 1924 Patented Nov. 6, 1928.

UNITED STATES WERNER A. KOCH, LOS ANGELES, CALIFORNIA.

BEAHEB AND BUBNISHING TOOL.

Application filed July 19, 1924. Serial No. 728,983.

This invention relates to improvements in reaming and burnishing tools.

An object of the invention is to provide a reamer having an expansible sleevecomposed l of separate sections, and to provide means whereby the expansible sleeve may expanded or contracted by rotation ofa single nut.

to a single cutter, and to provide means whereby said cutter may be advanced or withdrawn through the expansible sleeve on the reamer by rotation of a single nut.

Another object is to provide a reamer having an expansible sleeve and a cutter adapted to be advanced or withdrawn through said expansible sleeve, and to provide an improved chip throat, whereby any tendency for chips to remain in the throat and to become clogged on the edge of the cutter has been done away with.

Other objects will be made manifest in the following detailed description and specifically pointed out in the appended claims, reference being had to the accompanying drawings to be used for illustrative purposes, in which:

Figure 1 is a side elevation of the improved reamer,

N Fig. 2 is a vertical section taken substantially on the line 2-2 of Fig. 1, in the direction indicated,

. Fig. 3 is a vertical section talren substantially on the line 3-3 of Fig. 1, 1n the direction indicated,

Fig. 4 is an end elevation of the reamer taken from the right hand end of Fig. 1,

Fig. 5 is a side elevation of the reamer, parts being broken away and showirin section, taken substantially on a medial line through the reamer,

Fig. 6 is an enlarged detail section of the reamer, showing the cutter in elevation,

Fig. 7 is a section taken through the mandrel, which forms one of the parts of the improved reamer,

Fig. 8 is a side elevation of the mandrel,

- parts being broken away,

Fig. 9 is an end elevation, shown as lookin from the left hand end of Fig. 8,

Fig. 10 is a section taken substantially on the line 10-10 of Fig. 8, in the direction indicated,

Fig. 11 is a section taken substantially on the line 1111 of Fig. 8,

Another object is to provide a reamer with Fig. 12 is an end elevation of the mandrel taken as looking from the right hand end of 8, ig. 13 is a top plan view of the cutter,

F g. 14 s a side elevation of the same,

Fig. 15 is an end view of the cutter shown in F gs. 13 and 14,

Fig. 16 is a vertical section taken substantially on the line 16-16 of Fig. 14,

Fig. 17 is a top plan view of one of the sections, which -go to form the expansiblesleeve,

Fig. 18 1s a side elevation of the section shown in Fig. 17, and

Figs. 19 and 20 are end elevations looking from the left and right ends of Fig. 18 respectively.

Referring to the drawings in which similar reference characters designate similar parts, a mandrel 15 is provided with a plurality of flat surfaces 16, which surfaces 16 taper from one end of the mandrel toward the other, and is provided with suitable end extenslons 17 and 18. The end 17 is provided with a square end 19, and the end 18 is threaded and terminates in a suitable cylindrical shank 20. Longitudinally of the mandrel 15, the end extension 18 and the shank 20, is out a groove or channel 21, clearly shown in Figs. 10, 11 and 12. The bottom of this groove is slightly inclined toward the enlarged end of the mandrel 15, and has the surface of its bottom 22 parallel with the flat tapered surfaces 16 on the mandrel 15.

Within this groove or channel 21 is adapted to slide a suitable cutter 23, which has its bottom surface 24 slightly inclined and adapted to rest upon the bottom surface 22 of the groove 21. The cutting edge 25 of the cutter 23 is designed to be parallel to the axis of the mandrel in any position taken by the cutter within the groove or channel-21. On each of the surfaces 16 of the mandrel 15 are mounted at suitable distances apart a plurality of shoulders or keys 26.

The expansible sleeve adapted to be expanded upon the mandrell 15 is composed of a plurality of sections 27 having arcuate outer surfaces 28 and inclined inner surfaces 29 adapted to bear against the inclined sur- I faces 16 of the mandrel 15. A section 27 bears upon each of the surfaces 16. Each section 27 has upon its under side a suitable keyway or channel 30, adaited to fit and slide upon the shoulders 26. ach end of each section 27 is provided with grooves 31 and 32 respectively, which, when the sections 27 are assembled to form the expansible sleeve, will form a circumferential groove adapted to receive and retain a split ring 33 of spring steel adapted to urge the sections 27 into contracted position causing them to bear tightly upon the surfaces 16. Each section 27 is also provided at one end w1th an extension 34 providing a pro ect10n 35, which, when the sections 27 are assembled to form an expansible sleeve, will form a circumferential shoulder adapted to be received 1n a groove 36 within a nut 37, which is adapted to be screwed upon the threaded end 18 toward the smaller end of the tapered mandrel 15.

The sleeve is caused to expand or to be con.- tracted by merely rotating the nut 37. It is seen that if the nut 37 is caused to be unscrewed towards the remote end of the threaded end 18 from the mandrel 15 that the sleeve formed by the assembly of the sections 27 will be drawn toward the narrower end of the mandrel 15, thereby allowing the sleeve formed by the assembly of such sections to be contracted. If the nut 37 is rotated in the opposite direction, the sections 27 will be forced toward the larger end of the mandrel 15 and will be caused to spread forming a sleeve of enlarged diameter. The exterior surfaces 28 of the sections 27 will at all times remain parallel to the axis of the mandrel.

The cutter 23 which is adapted to slide within the channel 21 is also provided with an extension 38 having a projection 39 adapted to be retained and slidingl fitted in a groove 40 within a nut 41. is nut 41 is also mounted upon the threaded end 18 above or at the other side of the nut 37 from the tapered mandrel 15. It is seen that rotation 4 of the nut 41 will cause the cutter 23 to be either advanced toward the enlarged end of the mandrel 15 or to be withdrawn therefrom, causin the cutting ed e to be advanced or wit drawn through t e sleeve, the cutting edge of the cutter 23 also remaining parallel to the axis of the mandrel in any position.

The chip throat is partially provided by a hollowing or grinding out of a portion on one side of the cutter, as indicated at 42; the remaining portion of the chip throat is provided by a hollowing or grinding out of a portion of the mandrel 15, as indicated at 43, so as to be somewhat complementary to the hollow portion 42. A feature of the chip throat so constructed is that the lower edge 44 of the hollow 42 is not flush with the surface 43, enabling chi s or parings cut during the rotation of t e reamer, which tend to curl, to drop ofi when passing the edge 44 and to be dropped out throu h the chip throat. In other words, the sur ace 43 being lower than the surface 42 will provide a clearance for the chips.

The above described reamer has been primarily designed for roaming and burnishing bearings of soft metal, and its mode of operation will therefore be described in connection therewith, although it is to be understood that this reamer may be used in connection with any cylindrical hole, journal, or similar construction.

The expansible sleeve composed of the sections 27 is first withdrawn toward the small end of the mandrel 15 and inserted into the bearing. The nut 37 is then rotated so as to advance the sections 27 toward the enlarged end of the mandrel 15, causing the exterior surfaces 28 to engage the surface of the bearing. The nut 41 is then rotated so as to advance the cutter toward the large end of the mandrel 15 until the cutting edge is advanced into the middle of the bearing the distance desired for one cut. The reamer is then rotated and a cut taken off the complete inner surface of the bearing. After a complete cut is taken, or when it is desired that a portion thereof be taken, the nut 37 may be rotated so as to advance the expansible sleeve still farther on the mandrel 15, causing a tight fit to be maintained against the surface of the bearing.

In this manner the reamer will be continually self-centered within the bearing while the cutting operation is taking place. By providing the exterior surfaces 28 of the sections 27 with ground surfaces, ground to the so-called mirror finish, the reamer upon being rotated will give a smoother and more polished surface to the bearing as the reamer is rotated than will be accomplished if the sections 27 were merely made of soft steel. The exact internal diameter of the hearing will be determined without withdrawal of the reamer by applying calipers or a micrometer to the projecting ends of the sections 27. The end 17 with its square shank 19 and the end 20 enable the reamer to be mounted in a boring fixture, if desired.

It is seen that I have provided a reamer having an expansible sleeve composed of sections, and have provided means urging these sections to tightly bear upon the surface of the mandrel. 'lhe expansible sleeve may be expanded or contracted by rotation of a single nut. The cutter may be advanced into the work or withdrawn therefrom by a single nut, which nut is mounted upon the same end of the reamer carrying the nut which ex ands or contracts the sleeve. An improve chip throat is disclosed wherein provision is made for the escape of chips therethrough, and has overcome the disadvantage of allowing curlings or parings cut from the work to remain therein and clog the cutter.

It is to be understood that the drawings and above description are used for illustrative III purposes only, and that various modifications and variations may be made without departing from the spirit of the invention as delinec by the appended claims.

\Vhat is claimed is: i

1. A running and burnishing tool comprising a mandrel, an expansible sleeve slidable upon themandrel, a nut adapted to cause said sleeve to slide ill-either direction, a cutter slidabl; mounted upon said mandrel and adapted to be advanced or withdrawn through said sleeve by means of a second nut, both of said nuts being located upon the same end of the mandrel. 2. A reaming and burnishing tool compris- 1 mg a mandrel, a sleeve mounted thereon, a cutter slidable thereon, and a chip throat formed from the bodies of the cutter and the mandrel, adjacent surfaces of the mandrel and the cutter forming said chip throat being otherwise than flush.

In testimony whereof I have signed my name to this specification.

WEHNER A. KOCH. 

